CN113402199B - Additive, water-stable base layer using the additive and preparation method thereof - Google Patents
Additive, water-stable base layer using the additive and preparation method thereof Download PDFInfo
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- CN113402199B CN113402199B CN202110872522.0A CN202110872522A CN113402199B CN 113402199 B CN113402199 B CN 113402199B CN 202110872522 A CN202110872522 A CN 202110872522A CN 113402199 B CN113402199 B CN 113402199B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00008—Obtaining or using nanotechnology related materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses an additive, a water-stable base layer using the additive and a preparation method thereof, and belongs to the technical field of highway pavement construction. The additive comprises the following raw materials in parts by weight: 10 to 20 parts of hydration inhibition slow release type water absorbing resin, 30 to 50 parts of magnesium oxide, 5 to 10 parts of calcium oxide, 5 to 10 parts of sodium hydroxide, 10 to 20 parts of sodium sulfate, 0.1 to 0.6 part of retarder, 0 to 5 parts of sodium bromide, 0 to 10 parts of nano calcium silicate and 0 to 10 parts of nano silicon dioxide. The admixture of the invention can improve various performances of the water-stable base layer after the admixture with high doping amount is added to replace cement, prolong the construction time of the corresponding water-stable base layer and improve the economic benefit.
Description
Technical Field
The invention relates to an additive, a water-stable base layer using the additive and a preparation method thereof, and belongs to the technical field of highway pavement construction.
Background
The water-stable base layer is a cement-stable crushed stone layer for short, namely cement is adopted to solidify graded crushed stone, and the cement-stable base layer is completed through compaction and maintenance. The technical Specification for highway pavement basic construction (JT J034-2000) prescribes the delay time between the water adding and mixing of cement stabilized granules and the rolling completion: and adopting concentrated plant mixing for no more than 2 hours and adopting road mixing for no more than 3-4 hours. This is difficult to achieve for some construction equipment and units where organizational management conditions are not ideal. In particular, under the condition of improving the strength grade of cement, the cement ISO standard is implemented, the fineness is finer, the mixing amount of mixed materials is reduced, the hydration speed is higher, and the problems of insufficient strength margin coefficient, low compactness, poor core sample integrity, poor anti-scouring performance and the like of water-stable materials caused by delayed rolling are easy to occur. In addition, as the national requirements on environmental protection are higher, the price of cement is also increased, and the unilateral cost of the cement stabilized macadam is increased by about 5-10 yuan.
In the existing roller compacted concrete technology, the method for replacing cement by using fly ash or other admixture with pozzolanic activity is available, the cement consumption is reduced, the cement hydration can be slowed down to a certain extent, and the advantages of high compactness, high later strength, high durability and low cost of the water stable material are realized by utilizing the characteristics that the density of the admixture such as fly ash is smaller than that of cement, the pozzolanic effect and economy and cheapness are utilized, so that win-win-win effect of technology and economy is achieved. However, the application effect of the admixture such as fly ash in cement stabilized macadam can not reach the expectation, and the main appearance is that: the requirement of the strength of the cement stabilized macadam 7d limits the mixing amount of the fly ash, and the fly ash has low early activity, can only be used as a filling material with low mixing amount in the cement stabilized macadam layer, does not exert the pozzolan effect, and has limited economic benefit.
At present, research is carried out on exciting the early activity of the fly ash by adding various chemical reagents, but the exciting effect is not ideal, the maximum mixing amount of the fly ash can only reach 30-50%, the cement dosage is required to be increased at the same time under the mixing amount, and the economic benefit generated by replacing cement with the blending materials such as the fly ash is weakened. Therefore, the existing cement stabilized macadam uses the admixture such as the fly ash to replace cement, and the problems of low fly ash mixing amount, poor early strength, short construction time from stirring production to rolling completion, maintenance in the pozzolan effect generation and later active reaction after 7d of moisture preservation, large shrinkage deformation and easy cracking of the cement stabilized macadam and the like still exist.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an additive, a water-stable base layer using the additive and a preparation method thereof.
The first object of the invention is to provide an additive, which comprises the following raw materials in parts by weight: 10 to 20 parts of hydration inhibition slow release type water absorbing resin, 30 to 50 parts of magnesium oxide, 5 to 10 parts of calcium oxide, 5 to 10 parts of sodium hydroxide, 10 to 20 parts of sodium sulfate, 0.1 to 0.6 part of retarder, 0 to 5 parts of sodium bromide, 0 to 10 parts of nano calcium silicate and 0 to 10 parts of nano silicon dioxide.
The invention can inhibit C in cement particles by adopting the hydration inhibition slow-release type water-absorbing resin and retarder to be matched 3 A, inhibiting C in cement particles 3 The hydration rate of S in the age of 1-2 d effectively regulates and controls the cement hydration acceleration period course under the action of nano calcium silicate and nano silicon dioxide, and the acceleration effect of the nano calcium silicate and the nano silicon dioxide on the hydration degree of 3-7 d is not influenced while the early hydration rate is delayed.
Meanwhile, the admixture is applied to a water-stable low-gel system of low-volume cement and high-volume admixture, the retarder is continuously dissolved and adsorbed in an alkaline solution environment, the retarder plays a role in dispersing cement, nano calcium silicate and nano silicon dioxide, the nano calcium silicate and the nano silicon dioxide consume calcium hydroxide in the alkaline solution, and the formation of hydration products is accelerated to provide 3-7 d early strength so as to overcome the defect of insufficient early hydration degree of the high-volume admixture and low-cement gel system. And the combined action of alkali and salt components in the alkaline solution excites the potential activity of the admixture: from OH in solution - Breaking part of Si-O bond and Al-O bond in original glassy network with high polymerization degree to form a non-porous glassSaturation of active bonds promotes network depolymerization and dissolution and diffusion of silicon aluminum to form hydration products, and then salts accelerate the generation of hydration products so as to promote the development of early and later performances of the admixture to a gel system.
Further, the hydration inhibition slow release type water absorbing resin is prepared by mixing 40% -60% of corn starch dextrin and 40% -60% of porous acrylic acid water absorbing resin in a molten state, stirring, and selecting a part below 75 μm through spray cooling.
The hydration inhibition slow-release type water-absorbing resin is combined with water to generate natural expansion, and the binding effect of the starch dextrin in the hydration inhibition slow-release type water-absorbing resin on water molecules in a gel state is further improved, so that the water in the gel is difficult to lose, the water storage stability of the hydration inhibition slow-release type water-absorbing resin in an alkaline solution is enhanced, a miniature water storage reservoir is formed in the hydration inhibition slow-release type water-absorbing resin, and then the hydration inhibition slow-release type water-absorbing resin is slowly evaporated and released under the action of ambient temperature and air. On one hand, the method can ensure that the cement paste is maintained in a moist state, inhibit the drying shrinkage of the cement paste, and on the other hand, the method can provide water required by hydration of the magnesium oxide and the admixture under a dry condition so as to accelerate the generation of hydration products. The magnesium oxide can generate micro-expansion in the late hydration process, and the hydration product magnesium hydroxide can effectively fill gaps and micro-cracks, so that the system has good volume stability in the late stage, and is favorable for effectively compensating thermal shrinkage deformation and preventing thermal shrinkage cracks.
Further, coarse magnesium oxide is adopted as the magnesium oxide, the sintering temperature is 700-800 ℃, and 50-200 meshes of particles are taken after grinding.
Further, the retarder is any one or more of sodium gluconate, sodium citrate and boric acid.
The second object of the invention is to provide the application of the additive, which is used for the cement stable crushed stone layer with the cement replacement rate of 50-80%. The cement stabilizing gravel layer with high admixture replacing cement is applied to the cement stabilizing gravel layer with high admixture replacing cement, and a large amount of admixture replacing cement is beneficial to reducing the early hydration rate of a gel system and is matched with retarder and hydration inhibitorInhibiting C in cement particles by preparing slow-release type water-absorbent resin and the like 3 Hydration rate of S in the 1-2 d age.
Further, the dosage of the additive is 2-5% of the weight of the additive in the cement stabilized crushed stone layer.
Further, hydration inhibition slow-release type water-absorbing resin, magnesium oxide, calcium oxide, sodium hydroxide, sodium sulfate, retarder and sodium bromide in the additive form a solid component, and nano calcium silicate and nano silicon dioxide form a liquid component; when the admixture is added, the solid component is mixed with the admixture to form a solid mixture, and then the solid mixture is mixed with the liquid component.
The third object of the invention is to provide a water-stable base layer using the additive, which comprises the following raw materials in parts by weight: 100 parts of aggregate, 2.5-4 parts of admixture, 0.05-0.2 part of additive, 1-2.5 parts of cement and 5-6.5 parts of water.
Further, the dosage of the additive is 2-5% of the dosage of the admixture.
The fourth object of the present invention is to provide a method for preparing a water-stable base layer by using the above additive, comprising the following steps:
s1, uniformly mixing solid raw materials in the additive with the admixture to obtain a solid mixture; and uniformly mixing the liquid raw materials in the additive with part of water to obtain a liquid mixture.
S2, mixing and uniformly stirring the solid mixture and the liquid mixture to obtain the external admixture.
And S3, mixing the externally added admixture, cement and the rest water, uniformly stirring, adding aggregate, and uniformly stirring to obtain the cement.
The beneficial effects of the invention are as follows:
1) The admixture of the present invention can excite the early activity of the admixture, and properly prolong the construction time from stirring production to rolling completion while ensuring that the 7d strength meets the requirement, and the gel system of the admixture is not basically hydrated or is slightly hydrated during the construction period. Meanwhile, the water can be provided for the pozzolan effect and the later-stage active reaction of the cement stabilized macadam, so that the gel system added with the admixture with large doping amount of the admixture has the later-stage self-maintenance function. In addition, the additive disclosed by the invention can improve the volume stability of the cement stabilized macadam and reduce shrinkage deformation and cracking of the cement stabilized macadam.
2) The admixture is mainly applied to the cement stabilized crushed stone layer with the admixture substitution cement rate of 50-80%, meets the 7d strength requirement, improves the cement substitution rate of the admixture, is beneficial to reducing the manufacturing cost of the cement stabilized crushed stone layer and improves the economic benefit.
3) The rolling forming time of the water-stable base layer adopting the additive can be widened to 4 hours, the 7d unconfined compressive strength of the water-stable base layer exceeds that of the pure cement stabilized macadam by more than 10%, the compactness is improved by more than 1%, the core sample integrity is improved by more than 1%, the unilateral cost is reduced by 5-10 yuan, and the water-stable base layer has the advantages of high splitting strength, high flexural tensile strength, high scouring resistance, low shrinkage deformation and the like in a long-term, is beneficial to prolonging the service life of a road, and simultaneously realizes solid waste utilization, low cost, environmental protection and economy.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be within the scope of the present invention, based on the embodiments of the present invention.
The invention provides an admixture which comprises the following components: the adhesive comprises the following raw materials in parts by weight: 10 to 20 parts of hydration inhibition slow release type water absorbing resin, 30 to 50 parts of magnesium oxide, 5 to 10 parts of calcium oxide, 5 to 10 parts of sodium hydroxide, 10 to 20 parts of sodium sulfate, 0.1 to 0.6 part of retarder, 0 to 5 parts of sodium bromide, 0 to 10 parts of nano calcium silicate and 0 to 10 parts of nano silicon dioxide. Wherein the hydration inhibition slow-release type water-absorbing resin is prepared by mixing 40% -60% of corn starch dextrin and 40% -60% of porous acrylic acid water-absorbing resin in a molten state, stirring for 15min at a stirring speed of 40-80 r/min, rapidly cooling by spraying, and selecting a part below 75 μm.
The magnesium oxide and the calcium oxide in the formula are coarse grain products, the sintering temperature of the magnesium oxide is 700-800 ℃, and 50-200 meshes of particles are obtained after grinding in a ball milling mode. The magnesium oxide particles obtained in this way are in a polygonal spheroid shape, and the puffing reaction time is mainly concentrated in 3-180 d. The granularity of coarse calcium oxide is 100-300 meshes, and the main hydration reaction time is 6-24 hours. The retarder adopted by the invention is one or more of sodium gluconate, sodium citrate and boric acid, and the mixing amount of the retarder is 1-3% of the cement tricalcium aluminate or tetracalcium aluminoferrite in the water-stable base layer formula. Meanwhile, sodium hydroxide, sodium bromide and sodium sulfate are all industrial grade products in solid flake or coarse particle shape, the content is not less than 98%, and the time required for complete dissolution is more than 4 hours. The nano calcium silicate and the nano silicon dioxide in the formula are liquid or sol, the solid content of the nano calcium silicate and the nano silicon dioxide is 20-40%, and the hydration reaction time of the nano calcium silicate is 6-7 d.
The invention also provides application of the admixture, which is used for the cement stabilized crushed stone layer with the cement replacement rate of 50-80%. The dosage of the additive is 2-5% of the weight of the additive in the cement stabilized crushed stone layer. The using method comprises the following steps: the solid component is mixed with the admixture to form a solid mixture, and the solid mixture is mixed with the liquid component.
The invention further provides a water stabilization base layer applying the additive, which comprises the following raw materials in parts by weight: 100 parts of aggregate, 2.5-4 parts of admixture, 0.05-0.2 part of additive, 1-2.5 parts of cement and 5-6.5 parts of water. Wherein, the dosage of the additive is kept to be 2 to 5 percent of the dosage of the admixture. Aggregate in the formula is designed according to a compact structure of aggregate, and the proportion of aggregate with each grain diameter is as follows: 19.0-31.5 mm: 9.5-19.0 mm: 4.75-9.5 mm: 0.075-4.75 mm: 0-0.075 mm = 14% -32%: 28% -48%: 16% -36%: 22% -32%: 0% -3%.
The admixture in the formulation is an admixture with volcanic ash activity and comprises powderAny one or more of coal ash, mineral powder, phosphorus slag powder and the like. Wherein when the admixture adopts fly ash, the fly ash can be I-grade fly ash, II-grade fly ash, III-grade fly ash and lower-quality bottom fly ash, wet ash discharge or fly ash placed for many years, and the SiO thereof 2 The content is not less than 20%, and the density is 1900-2800 kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The 7d activity index is more than 50%, the 28d activity index is more than 50%, and the 90d activity index is more than 60%. When the admixture adopts mineral powder, the mineral powder can be a product obtained by refining metals such as iron slag, vanadium-titanium slag, manganese slag, lithium slag, zirconium slag and the like and processing residues. SiO (SiO) 2 The content is not less than 40%, the specific surface area is 200-1000 m 2 The particle morphology should be mainly polygonal cubes or spheroids; the 7d activity index is more than 50%, the 28d activity index is more than 60%, and the 90d activity index is more than 70%. The phosphorus slag powder adopted by the admixture is an accessory product after yellow phosphorus refining production, and P is obtained by water extraction and cooling of phosphorus slag slurry in saturated lime water, grinding and wind separation 2 O 5 The content is 0.5 to 1.5 percent, the content of active components is not less than 60 percent, and the specific surface area is 250 to 600m 2 Per kg, the density is 2600-3000 kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The 7d activity index is more than 50%, the 28d activity index is more than 50%, and the 90d activity index is more than 60%.
The invention finally provides a preparation method of the water-stable base layer applying the additive, which comprises the following steps:
s1, uniformly mixing solid raw materials in the additive with the admixture to obtain a solid mixture; and uniformly mixing the liquid raw materials in the additive with part of water to obtain a liquid mixture.
S2, mixing and uniformly stirring the solid mixture and the liquid mixture to obtain the external admixture.
And S3, mixing the externally added admixture, cement and the rest water, uniformly stirring, adding aggregate, and uniformly stirring to obtain the cement.
Example 1
The present example provides an admixture, which is obtained by respectively weighing 60g of hydration inhibition slow-release type water-absorbent resin, 180g of magnesium oxide, 30g of calcium oxide, 30g of sodium hydroxide, 60g of sodium sulfate and 0.6g of retarder, mixing and stirring 40% of corn starch dextrin and 60% of porous acrylic acid water-absorbent resin in a molten state, and selecting a part below 75 μm after spray cooling. In the embodiment, both the magnesium oxide and the calcium oxide adopt coarse-grain products, and the retarder adopts sodium gluconate. And uniformly mixing the components in the formula to obtain the additive product.
Example two
The present example provides an admixture, which was prepared by weighing 100g of hydration-inhibiting slow-release water-absorbent resin, 250g of magnesium oxide, 50g of calcium oxide, 50g of sodium hydroxide, 100g of sodium sulfate, 3g of retarder, 25g of sodium bromide, 50g of nano calcium silicate and 50g of nano silica, respectively. The hydration inhibition slow release type water absorbing resin adopted in the embodiment is obtained by mixing and stirring 60% of corn starch dextrin and 40% of porous acrylic acid water absorbing resin in a molten state, and selecting a part below 75 μm after spray cooling. In the embodiment, both the magnesium oxide and the calcium oxide adopt coarse-grain products, and the retarder adopts sodium citrate. Uniformly mixing hydration inhibition slow-release type water-absorbing resin, magnesium oxide, calcium oxide, sodium hydroxide, sodium sulfate and retarder in the formula to form a solid component, and then mixing nano calcium silicate and nano silicon dioxide to form a liquid component.
Example III
The present example provides an admixture, wherein 75g of hydration inhibition slow release type water absorbing resin, 200g of magnesium oxide, 40g of calcium oxide, 40g of sodium hydroxide, 75g of sodium sulfate, 2g of retarder, 15g of sodium bromide, 25g of nano calcium silicate and 25g of nano silica are weighed respectively, and the hydration inhibition slow release type water absorbing resin adopted in the present example is obtained by mixing and stirring 40% of corn starch dextrin and 60% of porous acrylic acid water absorbing resin in a molten state, and selecting a part below 75 μm after spray cooling. In the embodiment, the magnesium oxide and the calcium oxide are coarse-grained products, the retarder is sodium gluconate and boric acid according to the proportion of 1:1, and a compound product. Uniformly mixing hydration inhibition slow-release type water-absorbing resin, magnesium oxide, calcium oxide, sodium hydroxide, sodium sulfate and retarder in the formula to form a solid component, and then mixing nano calcium silicate and nano silicon dioxide to form a liquid component.
Example IV
The present example provides a water stable base layer, which is prepared by weighing 50kg of aggregate, 1.25kg of fly ash, 25g of admixture, 1.25kg of cement and 2.75kg of water, respectively, and then:
s1, uniformly mixing a solid component in the additive with the admixture to obtain a solid mixture; and uniformly mixing the liquid component in the additive with part of water to obtain a liquid mixture.
S2, mixing and uniformly stirring the solid mixture and the liquid mixture to obtain the external admixture.
And S3, mixing the externally added admixture, cement and the rest water, uniformly stirring, adding aggregate, and uniformly stirring to obtain the cement.
The additive adopted in the embodiment is the additive prepared in the embodiment III, the fly ash is the dry fly ash of a power plant, the low activity and the like, and the specific properties are shown in Table 1.
TABLE 1 fly ash Performance test results
Example five
The difference between this embodiment and the fourth embodiment is that: the formula of the water stable base layer in the embodiment is as follows: 50kg of aggregate, 2kg of mineral powder, 100g of additive, 0.5kg of cement and 3.15kg of water. The results of the performance test of the mineral powder used in this example are shown in Table 2.
TABLE 2 results of mineral powder Performance detection
Example six
The difference between this embodiment and the fourth embodiment is that: the formula of the water stable base layer in the embodiment is as follows: 50kg of aggregate, 1.5kg of phosphorus slag powder, 60g of additive, 1kg of cement and 3kg of water. The results of the performance test of the phosphorus slag powder in this example are shown in Table 3.
TABLE 3 phosphorus slag powder Performance test results
Comparative example one
The difference between this comparative example and the fourth example is mainly that: the formula of the water stable base layer of the comparative example is as follows: 50kg of aggregate, 2.5kg of cement and 3kg of water; no additive was added.
The unconfined compressive strength, the split tensile strength, the split rebound modulus, the flexural tensile strength, the dry shrinkage and the anti-scouring properties of the water-stable base layers prepared in examples four to six and the comparative example one were tested, and the test results are shown in tables 4 to 8.
Table 4 unconfined compressive strength test results
TABLE 5 split tensile Strength and split rebound modulus test results
TABLE 6 flexural tensile Strength test results
TABLE 7 results of dry shrinkage test
TABLE 8 results of the anti-scour test
| Scheme for the production of a semiconductor device | 90d flushing quantity (g) | 90d flushing mass loss (%) | Compared with the reference |
| Comparative example one | 9.6 | 0.15 | 100％ |
| Example 1 | 6.4 | 0.10 | 67％ |
| Example 2 | 7.1 | 0.11 | 73％ |
| Example 3 | 6.2 | 0.10 | 67％ |
As can be seen from tables 4 to 8, the water-stable base layer (cement-highly blended stabilized macadam) prepared in each example of the present invention was more excellent than the comparative example one (pure cement stabilized macadam), and was significantly superior to the pure cement stabilized macadam in terms of unconfined compressive strength, split tensile strength, split rebound modulus, flexural tensile strength, dry shrinkage and anti-scour properties. Therefore, the invention realizes the preparation of the cement-high admixture stabilized macadam with low price and excellent performance through the matching of the admixture and the admixture.
The foregoing is merely a preferred embodiment of the invention, and it is to be understood that the invention is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (9)
1. An admixture characterized in that: the adhesive comprises the following raw materials in parts by weight: 10-20 parts of hydration inhibition slow release type water absorbent resin, 30-50 parts of magnesium oxide, 5-10 parts of calcium oxide, 5-10 parts of sodium hydroxide, 10-20 parts of sodium sulfate, 0.1-0.6 part of retarder, 2-5 parts of sodium bromide, 3.34-10 parts of nano calcium silicate and 3.34-10 parts of nano silicon dioxide; the hydration inhibition slow-release type water-absorbing resin is prepared by mixing 40% -60% of corn starch dextrin and 40% -60% of porous acrylic acid water-absorbing resin in a molten state, stirring, and selecting a part below 75 mu m through spray cooling.
2. An admixture according to claim 1, wherein: the magnesium oxide adopts coarse-grained magnesium oxide, the sintering temperature is 700-800 ℃, and grains with 50-200 meshes are taken after grinding.
3. An admixture according to claim 1, wherein: the retarder is any one or more of sodium gluconate, sodium citrate and boric acid.
4. Use of an admixture according to any one of claims 1-3, characterized in that: the cement-based additive is used for cement-stabilized crushed stone layers with cement substitution rate of 50-80%.
5. The use of the admixture according to claim 4, wherein: the dosage of the additive is 2-5% of the weight of the additive in the cement stabilized crushed stone layer.
6. The use of the admixture according to claim 4, wherein: the hydration inhibition slow-release type water-absorbing resin, magnesium oxide, calcium oxide, sodium hydroxide, sodium sulfate, retarder and sodium bromide in the additive form a solid component, and the nano calcium silicate and nano silicon dioxide form a liquid component; when the admixture is added, the solid component is mixed with the admixture to form a solid mixture, and then the solid mixture is mixed with the liquid component.
7. A water stable base layer using the admixture of any one of claims 1-3, characterized in that: the composite material comprises the following raw materials in parts by weight: 100 parts of aggregate, 2.5-4 parts of admixture, 0.05-0.2 part of additive, 1-2.5 parts of cement and 5-6.5 parts of water.
8. A water stable base layer using an admixture as claimed in claim 7, wherein: the dosage of the additive is 2-5% of the dosage of the admixture.
9. A process for the preparation of a water stable base layer using the admixture of any one of claims 1 to 3, characterized in that: the method comprises the following steps:
s1, uniformly mixing solid raw materials in the additive with the admixture to obtain a solid mixture; uniformly mixing the liquid raw material in the additive with part of water to obtain a liquid mixture;
s2, mixing and uniformly stirring the solid mixture and the liquid mixture to obtain an external admixture;
and S3, mixing the externally added admixture, cement and the rest water, uniformly stirring, adding aggregate, and uniformly stirring to obtain the cement.
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